I'm attaching a freecad file that is basically the closest I've been able to get to what I'm after. This file was created on the Part Design Workbench, using an additive tube to create the basic sigma shape. It's really close to what I want, I just can't figure out how to remove the overlapping parts in the hollowed out section, and how to put a proper end wall on the sigma (since I'd like it to follow the semi-circle profile of the sigma, and be angled along the curve at the end).
It originally seemed to me that boolean operations with a couple of primitive objects (specifically a couple toruses, and a couple cylinders) should have been able to give me the effect I'm looking for, but after several hours of playing with the boolean functions in both the Part Workbench and the Part Design Workbench, and reading/watching countless posts/videos on the internet I guess I just don't understand how the boolean operations work.
Thanks in advance for any help you guys can give,
Chris
Code: Select all
OS: Ubuntu Core 20 (ubuntu:GNOME/ubuntu)
Word size of FreeCAD: 64-bit
Version: 0.20.1.29177 +233 (Git) Snap 245
Build type: Release
Branch: tag: 0.20.1
Hash: f5d13554ecc7a456fb6e970568ae5c74ba727563
Python 3.8.10, Qt 5.15.3, Coin 4.0.0, Vtk 7.1.1, OCC 7.6.3
Locale: English/United States (en_US)
Installed mods:
* Curves 0.6.2